The article discusses how the use of 'green' hydrogen produced through water electrolysis powered by renewable energy has the potential to decarbonize industries. While there is significant research focused on improving the efficiency and costs of electrolysis through new catalysts and membranes, less attention has been given to the primary input of electrolyzer cells – water. Gradiant Corp., based in Boston, introduces ProtiumSource, an industry-first electrolyzer-ready water solution designed to support green hydrogen production from various water sources, such as seawater, brackish water, or treated wastewater. The solution integrates water treatment technologies into a three-phase system, including pretreatment, high-purity water production, and brine management for zero-liquid discharge. Reverse-osmosis, electrodeionization, and CFRO technologies are used to remove contaminants efficiently, produce high-purity water exceeding industry standards, and manage brine effectively. Governing claims that ProtiumSource operates with less energy consumption, cost savings, and increased water-recovery rates, making it essential for green hydrogen producers with stringent environmental requirements. The technology ensures minimal liquid waste discharge, leaving behind concentrated solids for easy management or beneficial reuse, thereby reducing the environmental impact of green hydrogen production.